1. Added new element: Debug - this element can be used for inspecting its children and space taken by them,
2. Added new element: Element can be used for injecting dynamic elements (usually conditionally) without breaking the fluent API chain. This is practically a syntactic sugar to simplify your code.
3. The AspectRatio element allows now to specify scaling rule: fitting width, height or available space.
4. The Image element supports now scaling rules: fitting width, height or available space, as well as scaling unproportionally.
5. Added more, commonly used page sizes (thank you for your work lmingle).
6. Bugfix: the GeneratePdf(Stream stream) method does not close the output stream (thank you for your suggestion tthiery).